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101

Diagnosing Switch Problems Port Mirroring

OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006 page 29-15

Note that when port mirroring is enabled, there may be some performance degradation, since all frames

received and transmitted by the mirrored port need to be copied and sent to the mirroring port.

Relationship Between Mirrored and Mirroring Ports

What Happens to the Mirroring Port

When you set up port mirroring and attach cables to the mirrored and mirroring ports, the mirroring port

remains enabled and is a part of the Bridging Spanning Tree until you protect it from Spanning Tree

updates by specifying an unblocked VLAN as part of the configuration command line. The mirroring port

does not transmit or receive any traffic on its own.

Mirroring on Multiple Ports

If mirroring is enabled on multiple ports and the same traffic is passing through these ports, then only one

copy of each packet is sent to the mirroring destination. When the packet is mirrored for the first time, the

switching ASIC flags the packet as “already mirrored” If the packet goes through one more port where

mirroring is enabled, that packet will not be mirrored again. If both mirroring and monitoring are enabled

then the packet will be either mirrored or monitored (i.e., sent to CPU), whichever comes first.

Using Port Mirroring with External RMON Probes

Port mirroring is a helpful monitoring tool when used in conjunction with an external RMON probe. Once

you set up port mirroring, the probe can collect all relevant RMON statistics for traffic on the mirrored

port. You can also move the mirrored port so that the mirroring port receives data from different ports. In

this way, you can roam the switch and monitor traffic at various ports.

Note. If the mirroring port monitors mirrored traffic on an RMON probe belonging to a different VLAN

than the mirrored port, it should be protected from blocking due to Spanning Tree updates. See “Unblock-

ing Ports (Protection from Spanning Tree)” on page 29-18 for details.

OmniSwitch 9700

Workstation

NMS

Mirroring

(Monitoring) Port

(w/ Copied Incoming

& Outgoing Frames)

Mirrored

(Active) Port

(w/ Incoming &

Outgoing Frames)

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